I know that this plugin is very difficult to go straight forward because it provides a gateway to an google interface that is constantly changing and introducing new elements. And all because google is not providing a proper API like facebook or twitter, so this type of fixes have to be implemented, in this case, it uses the mobile app connection to introduce the information in the Google Plus platform. But multiple errors are constantly arising: "Too many redirects" "A valid URL was not provided", that makes this plugin unsolvable.
Maybe in a future it is more stable, but now is totally unpredictable.